Details, datasheet, quote on part number: ADP3182
PartADP3182
CategoryPower Management => Regulators => Switching Regulators
DescriptionAdjustable Output 1-/2-/3-Phase Synchronous Buck Controller<<<>>>the ADP3182 is a Highly Efficient Multi-phase Synchronous Buck Switching Regulator Controller Optimized For Converting a 12 V Main Supply Into a High-current Low Voltage Supply For Use in Point-of-load (POL) Applications. It Uses a Multi-mode PWM Architecture to Drive The Logic-level Outputs at a Programmable Switching Frequency That CAN be Optimized For VR Size And Efficiency. The Phase Relationship of The Output Signals CAN be Programmed to Provide 1-, 2-, or 3-phase Operation, Allowing For The Construction of up to Three Complementary Buck Switching Stages.
CompanyAnalog Devices
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Features, Applications
FEATURES

Selectable or 3-phase operation to 1 MHz per phase 2% Worst-case differential sensing error over temperature Externally adjustable 5 V output from 12 V supply Logic-level PWM outputs for interface to external highpower drivers Active current balancing between all output phases Built-in power good/crowbar functions Programmable short circuit protection with programmable latch-off delay

APPLICATIONS
Auxiliary supplies DDR memory supplies Point-of-load modules

The is a highly efficient multi-phase synchronous buck switching regulator controller optimized for converting 12 V main supply into a high-current low voltage supply for use in point-of-load (POL) applications. It uses a multi-mode PWM architecture to drive the logic-level outputs at a programmable switching frequency that can be optimized for VR size and efficiency. The phase relationship of the output signals can be programmed to provide or 3-phase operation, allowing for the construction up to three complementary buck switching stages. The ADP3182 also provides accurate and reliable short circuit protection and adjustable current limiting. ADP3182 is specified over the commercial temperature range to +85C and is available a 20-lead QSOP package.

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. www.analog.com Tel: 781.329.4700 Fax: 2004 Analog Devices, Inc. All rights reserved.

Specifications..................................................................................... 3 Test Circuits....................................................................................... 4 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Description.............................. 6 Typical Performance Characteristics............................................. 7 Theory of Operation........................................................................ 8 Start-Up Sequence........................................................................ 8 Master Clock Frequency.............................................................. 8 Output Voltage Differential Sensing.......................................... 8 Output Current Sensing.............................................................. 8 Current Control Mode and Thermal Balance......................... 9 Voltage Control Mode.................................................................. 9 Soft Start........................................................................................ 9

Current Limit, Short Circuit, and Latch-off Protection...........9 Power Good Monitoring........................................................... 10 Output Crowbar......................................................................... 10 Output Enable and UVLO........................................................ 10 Applications Information.............................................................. 12 Layout and Component Placement......................................... 12 General Recommendations.................................................. 12 Power Circuitry Recommendations.................................... 12 Signal Circuitry Recommendations.................................... 12 Outline Dimensions....................................................................... 13 Ordering Guide.......................................................................... 13 NOTES:........................................................................................ 15 NOTES:........................................................................................ 16

Revision PrA: Initial Version Revision PrB: Updated electrical table, added theory of operation section and typical application circuit

SPECIFICATIONS
Parameter OSCILLATOR Frequency Range Frequency Variation

Output Voltage RAMPADJ Output Voltage RAMPADJ Input Current Range VOLTAGE ERROR AMPLIFIER Output Voltage Range2 Accuracy Line Regulation Input Bias Current FBRTN Current Output Current Gain Bandwidth Product Slew Rate CURRENT SENSE AMPLIFIER Offset Voltage Input Bias Current Gain Bandwidth Product Slew Rate Input Common-Mode Range Output Voltage Range Output Current CURRENT BALANCE CIRCUIT Common-Mode Range Input Resistance Input Current Input Current Matching CURRENT LIMIT COMPARATOR Output Voltage Normal Mode In Shutdown Mode Output Current, Normal Mode Maximum Output Current Limit Threshold Voltage Current Limit Setting Ratio DELAY Normal Mode Voltage DELAY Overcurrent Threshold Latch-Off Delay Time

VRT VRAMPADJ IRAMPADJ VCOMP VFB IFB IFBRTN IO(ERR) GBW(ERR)
Referenced to FBRTN VCC mV FB forced to VOUT 3% COMP = FB CCOMP 10 pF CSSUM CSREF, Figure 2
CCSCOMP 10 pF CSSUM and CSREF ICSCOMP VSW(X)CM RSW(X) ISW(X)
VILIMIT(NM) VILIMIT(SD) IILIMIT(NM) VCL VDELAY(NM) VDELAY(OC) tDELAY IDELAY(SS) tDELAY(SS)

2 V, RILIMIT 0.8 V, IILIMIT 2 V, RILIMIT 250 k VCSREF VCSCOMP, RILIMIT 250 k VCL/IILIMIT RDELAY 250 k RDELAY 250 k RDELAY 250 k, CDELAY 12 nF During startup, DELAY 2.4 V RDELAY 250 k, CDELAY 12 nF

SOFT START Output Current, Soft-Start Mode Soft-Start Delay Time

 

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